JB/T 5420-2001 This standard is a revision of JB/T 5420-1991 "Co-rotating twin-screw plastic extruder". During the revision, major changes were made to the specifications and basic parameters; some technical requirements were modified and supplemented; and requirements for electrical testing that affect personal safety and production safety were added to the test methods. This standard specifies the specifications and basic parameters, technical requirements, safety requirements, test methods and inspection rules, marking, packaging, transportation and storage of co-rotating twin-screw plastic extruders. This standard applies to co-rotating twin-screw extruders used for mixing and granulating plastic polymer materials. This standard does not apply to special types of co-rotating twin-screw extruders such as polymerization and evaporation concentration. This standard was first released in July 1991, and this is the first revision. JB/T 5420-2001 Co-rotating twin-screw plastic extruder JB/T5420-2001 Standard download and decompression password: www.bzxz.net

ICS83.200
G95
JB
Machinery Industry Standard of the People's Republic of China
JB/T5420-2001
Co-rotating twin-screw plastic extruder| | tt | 2001
Foreword
This standard is a revision of JB/T5420-1991 "Co-rotating twin-screw plastic extruder". This revision mainly has changes in the following aspects: specifications and basic parameters have been significantly modified. Some technical requirements have been modified and supplemented. The safety requirements add new regulations that must be implemented that affect personal safety and production safety, and incorporate safety requirements into technical requirements. The test methods and inspection rules are combined into one chapter, and the requirements for electrical testing that affect personal safety and production safety are added to the test methods.
This standard replaces JB/T5420-1991 from the date of implementation. This standard was proposed and managed by the Plastic Machinery Branch of the National Technical Committee for Standardization of Rubber and Plastic Machinery. The unit responsible for drafting this standard: Lanzhou Lantai Plastic Machinery Co., Ltd., Research Institute of Chemical Machinery, Ministry of Chemical Industry. Units participating in the drafting of this standard: Jiangsu Keya Chemical Equipment Co., Ltd., Dalian Bingshan Rubber and Plastic Co., Ltd., Nanjing Rubber and Plastic Machinery Factory, Gansu Chemical Machinery Factory.
The main drafters of this standard: Lou Xiaoming, Kang Feng, Yang Zhairen, Li Shitong, Zhang Hongge, Zhao Jianhua, Jiang Kaichi. This standard was first released in July 1991, and this is the first revision. 1 Scope
Machinery Industry Standard of the People's Republic of China
Co-rotating twin-screw plastics extruder
Co-rotating twin-screw plastics extruderJB/T5420—2001
replaces JB /T5420~1991
This standard specifies the specifications and basic parameters, technical requirements, safety requirements, test methods and inspection rules, marking, packaging, Transportation and storage, etc. This standard applies to co-rotating twin-screw extruders used for mixing and granulating ingredients of polymer materials such as plastics. This standard does not apply to special types of co-rotating twin-screw extruders such as polymerization and evaporation concentration. 2 Referenced standards
The provisions contained in the following standards constitute provisions of this standard by being quoted in this standard. At the time of publication, the editions indicated were valid. All standards are subject to revision and parties using this standard should explore the possibility of using the latest version of the standard listed below. GB 191--1990
GB/T 1184—1996
GB/T 6388—1986
GB/T 10095—1988
GB/T11336—1989|| tt||GB/T 13306—1991
GB/T 13384--1992
HG/T 3228—1988
3 specifications and basic parameters
3.1 specifications| |tt||Packaging, storage and transportation pictorial mark
Shape and position tolerance without tolerance value
Transportation, packaging, receipt and delivery mark
Zhekai Line cylindrical gear accuracy||tt| |Straightness error detection
Signage
General technical conditions for mechanical and electrical product packaging
General technical conditions for rubber and plastic machinery painting Screw diameter: 20~180mm.
3.2 Basic parameters
The basic parameters of the extruder should comply with the provisions of Table 1. China Machinery Industry Federation approved the implementation on 2001-10-01 on 2001-05-23
Screw nut diameter diagram
mm
>20~30
>30- 40
>40~50
>50-60
>60-70
>7080
>80-90
> 90~100
>100~120
>120-150
>150~180
Screw aspect ratio range
24-48|| tt||Note: Use PP (MI=4~8) to evaluate the maximum output. 4 Technical requirements
JB/T5420-2001
Table 1 basic parameters
High screw capacity and soul conversion
r/min
400||tt| |300
≥250
Main motor power
kw
≥7.5
>15
≥37
≥ 45
≥55
75
110
160
≥220
>315
≥550||tt ||4.1 The extruder should comply with the requirements of this standard and be manufactured according to the drawings and technical documents approved by the prescribed procedures. 4.2 Technical requirements for the complete machine
4.2.1. Control system requirements
4.2.1.1 The screw should be able to adjust speed smoothly within the specified speed range. Maximum output
kg/h
24
48
>120
>150
≥180
250| |tt||a350
>500
≥700
≥1000
≥1700
4.2.1.2 The extruder must have an automatic temperature adjustment device , the heating and cooling of the machine are automatically controlled in sections. The temperature should be able to achieve stable control within the range of 20~300℃ (special requirements are 20~399℃). Relative to the set value, the temperature fluctuation is within ±3°C. 4.2.1.3 The temperature measurement end of the thermocouple should be in reliable contact with the barrel. 4.2.1.4 The head of the extruder should be equipped with test components and display instruments for detecting melt pressure. 4.2.2 Safety requirements
4.2.2.1 The coupling, V-belt drive and heating part of the extruder should have protective covers. 4.2.2.2 The external terminals of the electric heater should have safety protection measures. 4.2.2.3 The insulation resistance of the short-circuited power circuit and protection circuit shall not be less than 1M0. 4.2.2.4 The cold insulation resistance of the electric heater shall not be less than 1M0. 4.2.2.5 Electric heaters should undergo a withstand voltage test. 4.2.2.6 The connecting conductor resistance of any exposed conductor parts of protective wire terminals and circuit equipment shall not be greater than 0.12. 4.2.2.7 The entire extruder unit must be reliably grounded, and the grounding resistance shall not be greater than 4Q. 4.2.2.8 The electrical equipment of the extruder should be able to cut off the power supply with the main power switch. 4.2.2.9 There should be an emergency stop button on the extruder operation cabinet. The extruder electrical control system should have the following alarm and interlock functions: 4.2.2.10
a) The main motor overload alarm and stop;
2
b) The main lubricating oil circuit is broken Oil or low oil alarm: c) The machine head material pressure exceeds the set value and the alarm stops. JB/T5420—2001
d) The main motor and oil pump motor are electrically interlocked. That is, the oil pump motor does not start and the main motor cannot start: e) The feeding motor and the main motor are electrically interlocked. That is, the main motor does not start and the feeding motor cannot start. 4.2.2.11 The noise sound pressure level of the extruder during normal operation shall not be greater than 85dB (A) 4.2.2.12 The extruder or heavy parts should be equipped with lifting holes or rings for easy lifting. 4.2.3 Other requirements
4.2.3.1 The extruder must be equipped with a feeding device that can feed quantitatively, and it should be able to accurately control the feed amount. 4.2.3.2 Other exposed surfaces without anti-corrosion treatment should be evenly coated with a thin layer of grease to prevent rust. The painted surface of the product before leaving the factory should comply with the requirements of 3.4.5.1 paint film appearance in HG/3228-1988. 4.2.3.3 The base and frame should have a reference surface for placing the calibrator when installing the extruder for horizontal calibration. 4.2.3.4 The extruder should be shipped from the factory with a special device (tool) for screw disassembly. 4.3 Technical requirements for main parts
4.3.1. The mechanical properties of the screw core shaft steel after heat treatment should meet: tensile strength α, ≥1000MPa; service point α, ≥800MPa; impact value ≥58J/cm; the core shaft is equipped with screw elements (explosion elements, shear elements etc.) parts, the axis straightness in any direction should not be lower than the level 7 accuracy in GB/T1184-1996. 4.3.2 The working surface of the screw element should have good wear resistance. When nitrided steel is used, the depth of the nitrided layer after surface treatment shall not be less than 0.4mm, the hardness shall not be less than 950HV, the brittleness shall not be greater than level II, and the working surface roughness Ra value shall not be greater than 1.6 μm. 4.3.3 The working surface inside the barrel should be wear-resistant. When nitrided steel is used, the depth of the nitrided layer after surface treatment should not be less than 0.4mm, the hardness should be 30~60HV higher than that of the operating lever component, the runability should not be greater than level II, and the working surface roughness Ra value should not be greater than 1.6μm4.4 Assembly technical requirements
4.4.1 Screwwww.bzxz.net
4.4.1.1 The screw components are installed on the mandrel, and the contours of the connecting parts should be consistent, without obvious unevenness and good interchangeability. For different materials and different operating requirements, the screw combination should be replaced. 4.4.1.2 Before the mandrel and screw components are formally assembled, apply a thin layer of high-temperature resistant (≥350°C) lubricant on the clean mating surfaces. After installing the screw components, tighten the screw head so that the end faces of each component are firmly in contact with each other. 4.4.1.3 After the screw is installed, the straightness of the screw axis should not be lower than the level 8 accuracy in GB/T1184. 4.4.2 Barrel
After the barrel is assembled, the axis straightness of the two inner holes of the barrel shall not be lower than the level 8 accuracy in GB/T1184. 4.4.3 Barrel and screw
4.4.3.1 Before assembly, the outer surfaces of the two screws should be evenly coated with lubricant. 4.4.3.2 When the two screws are installed in the machine and in the normal working position, the screws and the barrel are allowed to be in contact, but they must not be stuck or scratched when they rotate in the same direction synchronously.
4.4.3.3 When assembling all heating components such as Simplified Chinese, the surface of the connecting threads should be evenly coated with high-temperature resistant (350°C) lubricant. 4.4.4 Transmission box
JB/T54202001
4.4.4.1 Gear accuracy should not be lower than the level 7 accuracy requirements in GB/T10095. 4.4.4.2 There should be no leakage at the joint surfaces and seals of the box. 4.4.4.3 After assembly, the injection direction of each fuel injection pipe and nozzle in the transmission box should ensure that oil can be sprayed to the lubricated parts. 4.4.5 The piping system should have no leakage under working pressure. 5 Test methods and inspection rules
5.1 Test methods
5.1.1 Test conditions
5.1.1.1 Test raw materials
Use PP (MI=4~8)|| tt||5.1.1.2 Test device
Co-rotating twin-screw plastic extruder with die head. 5.1.2 Test method
5.1.2.1 Electrical testing
5.1.2.1.1 The insulation resistance between the short-circuited power circuit and the protection circuit wire is measured with a 500V megger (woggmeter). The insulation resistance value should comply with the provisions of 4.2.2.3.
5.1.2.1.2 In the cold state (room temperature), use a 500V megohmmeter (player meter) to measure the heater insulation resistance. The resistance value should comply with the provisions of 4.2.2.4. 5.1.2.1.3 The electric heater should be heated first, and then pressurized to 1000V in a cold state (room temperature) for a withstand voltage test of at least 1 second, and the operating current should not be greater than 20mA.
5.1.2.1.4 The conductor resistance of the external protective conductor terminals and any exposed conductor parts of the electrical equipment is measured with a grounding resistance meter, and the resistance value shall comply with the provisions of 4.2.2.6.
5.1.2.1.5 Use a ground resistance meter to measure the ground resistance of the equipment. The ground resistance value should comply with the provisions of 4.2.2.7. 5.1.2.2 Dry running test
5.1.2.2.1 The transmission box should be independently tested for dry running. The continuous dry running time of the transmission box shall not be less than 2 hours. Check the following items: a) The rotation direction of the output shaft should be correct:
4.4.4.2; c) No periodic impact sounds and abnormal vibrations. 5.1.2.2.2 After the machine passes the final assembly, apply lubricant to the inner hole surface of the machine and the screw surface, conduct a low-speed idling test of no more than 3 minutes, and check the following items:
a) Screw space , there should be no interference or jamming between the rods and tubes; b) there should be no abnormality in the whole machine.
5.1.2.3 Load operation test
5.1.2.3.1 The load test can only be carried out after passing the idle operation test. 5.1.2.3.2 The load operation test should be conducted under the condition that each process condition is basically stable and the test material is well plasticized, and the relevant parameters should be tested. 5.1.2.3.3 Load operation detection
Check the following items during load operation:
a) All operation control switches and buttons should be flexible and effective: b) Screw speed adjustment should comply with the provisions of 4.2.1.1; 4
JB/T5420—2001
c) The automatic temperature adjustment device should be accurate and reliable, and the temperature adjustment should comply with the provisions of 4.2.1.2: d) There should be no interference between screws and rods: e) The supply volume of the feeder should be coordinated and matched with the output range of the host:) There should be no leakage at the connections of pipelines, valves, etc.: The action of the solenoid valve of the soft water cooling system should be sensitive, accurate and reliable: g) The oil temperature of the transmission box's oil tank It should not exceed 70℃; h) The noise when the machine is running should comply with the provisions of 4.2.2.11. The measurement position is 1.0m away from the outer edge of the machine and 1.55m above the ground. Measure 6 points evenly around and take the average value;
i) The entire machine operation should be smooth, without impact, abnormal vibration and Sound: i) Each fastener should not be loose.
5.1.2.4 Output Inspection
Under the conditions of ensuring that the material is fully plasticized, the extruder is operating and the process conditions are stable, the extruded product shall be sampled. The sampling time shall not be less than 1 minute, and the measurement Three times, take the average value, and then convert it to the hourly output of the extruder. 5.1.2.5 Testing of mandrel straightness: Test according to 5.3.2.2 in GB/T113361989. 5.1.2.6 Detection of screw
5.1.2.6.1 Detection of surface treatment: For nitrided steel screw, use furnace samples to test the hardness, depth and brittleness of the nitrided layer. 5.1.2.6.2 Detection of surface roughness: Use sample blocks to compare or use a roughness meter to detect. 5.1.2.6.3 Testing of outer circle straightness: Place the screw on the platform and fix it so that it cannot rotate freely, and then use a feeler gauge to measure the gap between the outer circle and the platform, or place the screw on a V-shaped iron on the platform. Use a dial indicator to measure the highest points of the helix of the blasting rod one by one, and then repeat the above process for every 90° rotation. 5.1.2.7 Detection of machine parts
5.1.2.7.1 Detection of surface treatment: The hardness, depth and brittleness of the nitrided layer of the nitrided steel machine parts are tested using the furnace samples. 5.1.2.7.2 Detection of inner hole surface roughness: Use sample block comparison or roughness meter to detect. 5.1.2.7.3 Inspection of the straightness of the inner hole: the diameter Dd7 (D is the diameter of the inner hole of the machine) shall be no less than the length-to-diameter ratio of the two cylinders, the collision degree Ra value of the outer circular surface shall not be greater than 0.8 μm, and the straightness For grade 7 inspection, the steel rod is inserted into the assembled barrel and can pass through the two inner holes of the barrel smoothly respectively.
5.1.2.8 Inspection of pipeline seals
There should be no leakage by visual inspection under working pressure. 5.1.2.9 The painted surface shall be visually inspected.
5.2 Inspection Rules
5.2.1 Each product must be inspected by the quality inspection department of the manufacturer before it can leave the factory. Documents proving product quality should be attached when leaving the factory. 5.2.2. Factory inspection
Before each product leaves the factory, it should undergo an idling test and undergo inspections in 4.2, 4.4.3.1, 4.4.3.2, 4.4.4.2, and 4.4.4.3. Load operation test can also be carried out before leaving the factory according to user requirements. 5.2.3 Type test
Type test shall be carried out according to 5.1.1 and 5.1.2. Type testing should be carried out in one of the following situations: a) Trial type identification when new products or old products are transferred to the factory; JB/T5420—2001
b) After formal production, there are any changes in structure, materials, processes, etc. When there are major changes that may affect product performance: c) During normal production, at least one unit is tested every year; d) When the product is resumed after two years of discontinuation; e) When the factory inspection results are significantly different from the last type test ;f) When the national quality supervision agency proposes type testing requirements 5.2.4. One unit shall be randomly inspected for each type test. If the unit fails to pass the inspection, another unit shall be randomly tested. If it fails again, the type test shall be deemed to be unqualified.
6 Marking, packaging, transportation and storage
6.1 Each product should have a product label fixed in a prominent position. The form, size and technical requirements of the label should comply with the regulations of GB/T13306. 6.2 Product labels should have the following basic contents: a) Manufacturer’s name and trademark;
b) Product name:
c) Product model:
d) Manufacturing date and serial number;| |tt||e) Main product parameters.
6.3 Rust prevention before leaving the factory should comply with the provisions of 4.2.3.2. 6.4 Product packaging should comply with the regulations of GB13384. 6.5 Factory technical documents:
a) Product certificate;
b) Product instruction manual:
c) Packing list.
6.6 Product transportation should comply with the regulations of GB191 and GB/T6388. 6.7 The product should be stored in a ventilated, dry place without fire sources or corrosive gases. If stored in the open air, antibacterial measures must be taken.
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